I found a great deal on a pair of bobcat Paris pumps but i'm not certain my size. I have tried on 2 pairs of ysl's one was a bootie (i have a high instep and it fit at size 40) in general I wear 39 in most shoes (louboutin, choo) I found rockstuds i'm a 39.5 (again due to an instep with the strap on the top) so would you order a 39.5 or 40? they are both in stock right now and I want to buy ASAP, any input would be helpful!